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Segment Information - Other Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other financial information [Abstract]      
Total assets $ 15,875.7 $ 18,815.1  
Goodwill 45.2 45.2 $ 46.6
Operating Segments [Member]      
Other financial information [Abstract]      
Total assets [1] 15,875.7 18,815.1 16,938.2
Goodwill 45.2 45.2 46.6
Capital expenditures 726.8 2,708.5 3,327.7
Operating Segments [Member] | Gathering and Processing [Member]      
Other financial information [Abstract]      
Total assets [1] 8,743.5 11,929.8 11,602.7
Goodwill 45.2 45.2 46.6
Capital expenditures 293.9 1,273.3 1,548.6
Operating Segments [Member] | Logistics and Transportation [Member]      
Other financial information [Abstract]      
Total assets [1] 6,860.0 6,741.8 5,180.6
Capital expenditures 414.0 1,412.2 1,767.0
Operating Segments [Member] | Other [Member]      
Other financial information [Abstract]      
Total assets [1] 86.3 1.0 3.2
Operating Segments [Member] | Corporate and Eliminations [Member]      
Other financial information [Abstract]      
Total assets [1] 185.9 142.5 151.7
Capital expenditures $ 18.9 $ 23.0 $ 12.1
[1] Assets in the Corporate and Eliminations column primarily include tax-related assets, cash, prepaids and debt issuance costs for our revolving credit facilities.